A Study of Induction Dosing With Peginterferon Alfa-2a and Ribavirin in Participants With Chronic Hepatitis C (CHC) Genotype 1 Infection

This study has been completed.

Sponsor:

Hoffmann-La Roche

ClinicalTrials.gov Identifier:

NCT00192647

First Posted: September 19, 2005

Last Update Posted: August 4, 2016

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This study will evaluate the addition of a higher-dose induction treatment period with peginterferon (PEG-IFN) alfa-2a (Pegasys) and ribavirin prior to standard-dose treatment with PEG-IFN alfa-2a and ribavirin, compared to standard-dose treatment, in treatment-naive participants with CHC, genotype 1 infection.

Percentage of Participants With Sustained Virological Response According to Scheduled Treatment Period [ Time Frame: Week 72 ]

Sustained virological response was calculated as the percentage of participants with undetectable (less than [<] 15 international units per milliliter [IU/mL]) hepatitis C virus (HCV) ribonucleic acid (RNA) as measured by the Roche TaqMan HCV Test 24 weeks after completion of the scheduled 48-week treatment period.

Secondary Outcome Measures:

Percentage of Participants With End-of-Treatment Virological Response According to Scheduled Treatment Period [ Time Frame: Weeks 48 ]

Virological response at the end of the scheduled treatment period was defined as the percentage of participants with undetectable (<15 IU/mL) HCV RNA as measured by the Roche TaqMan HCV Test at Week 48.

Percentage of Participants With Virological Responses Over Time [ Time Frame: Weeks 4, 8, 12, and 24 ]

Virological response was defined as undetectable HCV RNA (<15 IU/mL) as measured by the Roche TaqMan HCV Test. Participants without HCV RNA measurements at a study week are considered non responders at that study week.

Percentage of Participants With Relapse of End-of-treatment Virological Response [ Time Frame: Actual end of treatment (Week 48) up to last follow up (maximum up to Week 72) ]

Relapse was determined based on virological response at the actual end of treatment and was calculated by dividing the number of participants who achieved a virological response at end of treatment but later had detectable HCV RNA at the last assessment post-treatment by the number of participants with a virological response at end of treatment, defined as undetectable HCV RNA (<15 IU/mL). Participants who achieved a virological response at end of treatment but did not have any HCV RNA assessment during follow-up were excluded and were not considered as having relapsed. However, if no assessment was available within the end of-treatment time window but the participant had a sustained virological response according to the actual treatment period, backward imputation was used and the participant was considered to have achieved an end-of-treatment virological response in the analysis.

The ability of virological responses to predict sustained virological response according to the scheduled treatment periods was assessed in terms of positive predictive value (PPV) and negative predictive value (NPV). The PPV indicates probability of achievement of viral suppression (undetectable HCV RNA) for achieving a sustained virological response and the NPV indicates probability of not achieving viral suppression for not achieving a sustained virological response. The PPV at Week 4 or 12 was calculated as the number of participants who achieved viral suppression both at Week 4 or 12 and at Week 72 divided by the number of participants who achieved viral suppression at Week 4 or 12, multiplied by 100. The NPV at Week 4 or 12 was calculated as the number of participants who failed to achieve viral suppression at Week 4 or 12 and at Week 72 divided by the number of participants who failed to achieve viral suppression at Week 4 or 12, multiplied by 100.

Change From Baseline in Log10 HCV RNA Values [ Time Frame: Baseline, Weeks 4, 8, 12, 24, and at end of treatment (EoT) (maximum up to Week 48) ]

The mean decrease in log10 HCV RNA levels from baseline was assessed in both the induction group and the standard group.

Participants will receive 12 weeks of induction therapy with PEG-IFN alfa-2a (Pegasys), 360 micrograms (mcg) subcutaneous (SC) once weekly, along with ribavirin, 1000 or 1200 milligrams (mg) orally daily in divided doses. Thereafter, the dose of PEG-IFN alfa-2a will be reduced to 180 mcg SC once weekly and the ribavirin dose maintained for the remaining 36 weeks of treatment.

Drug: PEG-IFN alfa-2a

PEG-IFN alfa-2a will be administered once weekly for 48 weeks, at doses specified in respective arms.

Other Name: Pegasys

Drug: Ribavirin

Ribavirin 1000 or 1200 mg orally daily in divided doses, with the dose determined based on body weight, for 48 weeks.

PEG-IFN alfa-2a will be administered once weekly for 48 weeks, at doses specified in respective arms.

Other Name: Pegasys

Drug: Ribavirin

Ribavirin 1000 or 1200 mg orally daily in divided doses, with the dose determined based on body weight, for 48 weeks.

Other Name: Copegus

Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:

18 Years to 75 Years (Adult, Senior)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Diagnosis of chronic CHC, genotype 1

Chronic liver disease consistent with CHC on a biopsy sample obtained within the previous 36 months as judged by a local pathologist (all countries except Australia)